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Power Generation
Power Generation at Dam Site - None
Bureau of Reclamation Power Program
Narration
Geology
Lemon Dam is constructed on bedrock of the Cutler Formation (Lower Perian) consisting of red to gray calcareous siltstone, shale and sandstone with interbedded limestone. The bedrock is highly fractured and fissile and the shale interbeds readily slack when exposed to air. The dip of the bedrock beneath the dam is approximately 10 degrees to the south. Reconstruction drill hole data indicates that some of the limestone intererbeds contain solution channels. Foundation treatment consisted of a grout curtain, with a minimum depth of 160 feet across the valley floor and up both abutments, and a cutoff trench (1.5:1 side slopes) within the limits of the Zone 1 core and extending 5 feet into bedrock or to a minimum base depth of 30 feet. The trench was excavated to a 10-foot width in siltstone below the old river channel at elevation 7,883. The reservoir is in a narrow valley that is approximately half a mile wide and three miles long. It has a maximum storage capacity of 40,146 acre-feet with a surface area of 622 acres at a water surface elevation of 8,148 feet. The reservoir appears to be watertight since the siltstone and shale bedrock and randomly sorted glacial till are relatively impervious. Several northwesterly trending normal faults, downdropped to the north have been identified around the edge of the reservoir. There are no topographic of glomorphic indications that these faults are active. Where observed, the fault planes are tight and filled with a clay gouge that restricts the movement of water from the reservoir.
Links
| Recreation |
| Dams Located by State | USBR Colorado Dams | Upper Colorado Region Dams |
| Owner: Bureau of Reclamation, Western Colorado Area Office,
PO Box 60340, Grand Junction, CO 81506-0340, (970) 248-0690
| Operator: Florida Water Conservancy District,
1523 County Road 243, Durango, CO 81301, (970) 247-5332
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